CICm\>. 


u/ 


Circular   No.  72. 

I  inicil  States  Departmeul  rn  nlmi<\ 

BUREAU    OK    KNTOMOI.O'. 
i     11    HOWARD.  Bnli  '  ■  loglnl    tnd  ( 

KM    Hi  nil    KNOWN  LARY.H  01    Mil    'Iom'I  iiiiImiI    r.Hl 
I  Mint  STATES. 

ii\  Harbison  G.  I',  lb.  ^vT 

1.  Larvw  without  ;i  distinct  air  tube,  the  air  hole  with  Maps  hut  no  elongated 

.  floating  :it  surface  of  water  in  a  horizontal  position.     The  malaria 

Subfamily    iNOPHEl  in  B  3 

Larvae  with  a  distinct  elongated  air  tube  ;  floating  below  the  Biirface  ol  watei . 

usually  obliquely,  hanging  bj  the  tube  - 

2.  The  last  segment,  beyond  the  air  tube,  with  a  ventral  brush  or  rudder  in  the 

middle  ol  the  segment  behind  Bubfamily  Ci  inisv:         8 

Last  segment  without  a  median  hrush,  the  hairs  paired  on  the  two  sides, 

none  nn   mill-ventral   line  Suht'amily   S  \  BE  I  il  I  s  l  . 

Only  on.-  species,  in  leaves  ol  pitcher  plants  in  cold  bi 

•      Wyeomyia  smithix  Coquillett. 

I,    Ibbdomen  wTli  plumose  lateral  hairs  on  the  Brat  three  segments  onlj  ;  head 

with  plumose  hairs  I 

Abdomen  with  plumose  hairs  to  the  sixth  segment  ;   head  without  plumose 

hairs.     I  ives  in  hollow  trees  Anophela  barberi  Coquillett. 

t.  Latent  mthe'eighth  segment  below  the  air  hole)  with  one  long  lower 

tooth  followed  by  four  little  ones,  Anophela  franciscanut  McCracken. 

ral  combV^yd  one  lotfg  lower  tooth  followed  bj  three  little  ones. 

A  nopht  It  t  punctipi  nni 
Lateral  comb  with  th  •  lower  long  tooth  followed  by  another  as  long  or 

nearly   BO  *  •' 

».   Lateral  comb  With  the  upper  tooth  >h..n       .1  ;.<,,,/,,  i.  -  „m,  ulipt  nnis  Meigen. 

Lateral  comb  with  tbe  upper  tootA  long        .1  nopht  la  crucian*  Wiedemann. 

8.  Mouth  brush  folded  ootwa/d  when  not  in  use,  not   vibratile,  used  to  seize 

only.     Predaceons  on  other  mosquito  larva  7 

Month  hrush  folding  inward,  tailed,  vibraUle,  usualh  continually  in  motion. 

I  on  microscopic  organisms  and  vegetable  detritus  9 

\  plate  on  the  side  on  the  eighth  abdominal  segment.     Only  one  -; 

living  in  hollow   trees  ami  water  barrel-.;    beneficial. 

Megarhinus  portoricenns  von  Roder. 
A  patch  of  Bmall  scales  on  the  ride  oi  theeighth  abdominal  segment.  I  iving 
•  in  temporary  puddles;  beneficial  species  s 

s.  Labial  plate  (mentnm)  ol  bead  with  the  teeth  regular  and  alike. 

Psorophora  ciliata  Fabricius. 
bial  plate  with  the  next  to  the  basal  tooth  much  enlarged. 

Psorophora  howardii  Coquillett. 

here  n-< ■■!  have  t*rii  made  uniform  with  too* 
-  Bureau,  to  facilit  names 

employed  in  thatixiblieation  are  (riven  in  I 


10. 


Antennae  with  tuft  outwardly  placed,  in  a  notch,  the  apical  part  of  antenna 
slender;  air  tube  long,  over  three  times  as  long  as  wide 10 

Antennae  with   the  tuft  at  or  before  the  middle,  the  apical  part  not  more 
slender;  air  tube  usually  shorter  than  three  times  its  width  ..  17 

Lateral  comb  of  the  eighth  segment  a  patch  of  spines  11 

Lateral  comb  of  the  eighth  segment  a  row  of  bars ....  16 


mouth  brush 


head  hairs.. 


antcnnal  tuft 
...  antenna 
...eye 

thoracic 
^'::';-'3  hair  tufts 


-.-^lateral  abdom. 
hairs 

subdorsal 
■»-:;:*  abd.  hairs 

lateral  comb 
,-ai'r  tube 


ventral  brush 
anal  c*ills 


dorsal  ti 


Fig.  1.— Diagram  of  a  mosquito  larva  {Culexsalinarius),  with  names  of  the  parts  referred 
t'>  in  the  key  (original  I. 

11.  Anal  segment    with   a  row  of  hairs  along  the  ventral  line  to  base;  an  early 

spring  species       Oulicella  dyari  Coqnillett. 

Anal  segment  without  any  tufts  in  front  of  the  ventral  brash 12 

12.  Air  tube   with   four  paired   tufts   posteriorly   outwardly,  the   subapical   one 

moved  sideways  out  of  line 13 

Air  tube  with  four  to  ten  paired  tufts  along  the  posterior  line  in  a  straight 
row,  none  displaced 15 


I  :     \n  t ii l it*  over  Ave  timet  as  long  :i-  wide,  nearlj  straight,  without  marked 
tapering;  living  in  Iresh-water  pools,  rain  barrels,  etc. 

t'nli  i  aalinariua  Coquillett. 

\n  tube  lee*  than  Ave  times  m  long  as  wide,  tapering  rathei  rapid!}  att<-i 

the  middle,  somewhat  fusiform  in  shape  it 

ii.    \n  tube  five  times  as  long  a-  wide,  its  pecten  of  l ■"•  teeth;  subdorsal  hairs  ol 

thud   :\ 1 1 « 1   fourth   abdominal   segments   donbie.       introduced   il stic 

mosquito  (  ult  i  /"/'<>  ns  Linns  us. 

\  n  tnbe  four  times  as  long  as  wide,  its  pecten  "i  nine  teeth;  subdorsal  I 

..i  the  thud  and  fourth  abdominal  segments  single.     Southern  domestic 

mosquito  Culea  fatigant  Wiedemann.1 

16     \n    tube  "li^lith   expanded  ai   tip,     Bummei  Bwamp  mosquito.    The  adull 

does  not  bite  Culea  territant  Walker. 

An  tube  evenly  tapered  i<>  tip.     Living  in  permanent  pools  all  summer. 

<  'nh  i  taraalit  <  loquilletl . 
ii;.  Ban  ol  comb  in  a  perfect!}  regular  row  ;  >km  smooth.     Hibernates  as  fully 
grown  larva  in  permanent  pools  Melanoconion  melanurut  Coquillett. 

Bars  pi  comb  in  an  irregular  row  ;  -km  minutely  pilose.  • 

Mochlostyraa  erraticus  Dyar  and  Knab. 

17.  \u-  tnbe  strongly  inflated  ;   anal  segment  with  a  chitinous  ring,  pierced  bj  a 

r<  >w  of  tufts  along  the  ventral  line  18 

tnbe  not  inflated  ;  anal  segment  not  ringed,  or,  if  so,  without  tufts  along 

the  ventral  line  20 

18.  intennse  long  and  prominent  19 
Antenna?  less  long,  moderate  only.     Developing  rapidly  in  rain  puddles. 

a nih li ii iii i n  jamait  >  n^i-  Tl bald. 

19.  Lateral  comb  of  the  eighth  Begment   of  bu  or  -even  nearly  equal    teeth. 

Developing  rapidly  in  rain  puddles      Janthinosoma  scnyi  Dyar  and  Knah. 
Lateral  comb  of  the  eighth  Begment  of  Bve   teeth,  the   upper   and    lowei 
ones  small  Janthinosoma  />/;■</«>.  Coquillett. 

20.  Antennae  inflated  and  bent.     Rapidly  developing  in  rain  puddles. 

ibhamia  discolor  <  'oquillett. 
kntennse  not  markedly  inflated  <>i  bent       ...  21 

•_'l.  Head  with  a  lateral  prominent  angle  which  receives  a  process  "ii  the  man- 
dible.    In  c rah  h<iles  on  the  Florida  coast       Deinoceritet  cancer  Theobald. 
II. ad  without  Buch  an  angle  ■_*_' 

22.  Head  with  thick  club-like  hairs  Genus  UranoUcnia.* 
Head  with  the  usual  tine  hairs  only  23 

23.  \ir  tube  without  pecten;   several  chitinous   plates  on   the  abdomina 

ments.     In  hollow  trees  and  rain  barrels     Pneumaculex  rignifer  Coquillett. 
\n   tube  with  pecten;  abdominal  Begments  without  any  plates  before  the 

air  tube  ..  L'l 

24.  Air  tube  bottle-shaped  .  the  outer  halt  linear. 

Teeniorhynchus  perturbana  Walker. 

air  tube  regular! j  tapered  •_'"« 

_'"<.    Air  tube  with  a  row  of  hairs  beyond  the  pecten.  the  pair  of  tufts  at  ba t 

tube  ... 26 

Air  tube  without  a    row  of   hairs:   the   tuft    at   or  beyond  the  middle  of   the 
lube 


1 1'uUx  piyitni   in  parti     Nut  the  true  tutigmM  ol  India,  tmt  bo  called  by  Theobald      rbe  proper 
name  of  our  special  appears  to  be  Oulta  Bigot 

mocomon  atrutut  I  In  pari  I 
mlkimotomu  poftusta 
*  Three  species  differentiated  by  minute  characters     <  >ni  \  one  sp< 
Mtonts  ssppstriiM  Osten-Skcken. 


26.  Lower  head  tuft  with  three  long  hairs,  the  upper  multiple.     In  permanent 

water,  with  a  northern  distribution Culiseta  absdbrinus  Felt. 

Lower  and  upper  head  tufts  alike,  multiple 27 

27.  Basal  pecten  teeth  of  the  air  tube  with  one  branch.     In  pools,  barrels,  etc., 

with  western  distribution  —  __   Theobaldia  inddens  Thomson. 

Basal  pecten  teeth  of  air  tube  with  several  branches.     In  pools,  with  eastern 
and  southern  distribution Ciiliseta  consobrinus  Desvoidy. 

28.  Air  tube  with  several  hair  tufts 29 

Air  tube  with  only  one  pair  of  tufts 30 

29.  Air  tube  long;  anal  segment  with  a  complete  ring.     Living  in  pools  and 

rain  barrels Cider  restuans  Theobald. 

Air  tube  short;  anal  segment  not  fully  ringed.     An  early  spring  species. 

Ochlerotatus  trichurus  Dyar.1 

30.  Air  tube  with  the  hair  tuft  within  the  pecten 11 

Air  tube  with  the  hair  tuft  beyond  the  pecten , 33 

31.  Anal  segment  ringed  with  a  horny  plate 32 

Anal  segment  not  ringed.     In  pot  holes  in  rocks. 

•  Ochlerotatus  atropalpus  Coquillett. 

32.  Lateral  comb  of  the  eighth  segment  a  few  scales  in  a  row.     In  swamps,  with 

a  southern  distribution Aedes  tormentor  Dyar  and  Knab.2 

Lateral  comb  of  the  eighth  segment  a  large  patch  of  scales. 

Ochlerotatus  bimaculatus  Coquillett. 

33.  Pecten  of  the  air  tube  with  detached  teeth  outwardly 34 

Pecten  of  the  air  tube  with  all  the  teeth  evenly  spaced 38 

34.  Air  tube  four  times  as   long  as  wide;  lateral  comb  of  the  eighth  segment  a 

patch  of  scales  three  rows  deep.     An  early  spring  species. 

Ochlerotatus  abfitchii  Felt. 

Air  tube  three  times  as  long  as  wide  or  less;    lateral  comb  of  the  eighth 

segment  of  few  scales 35 

35.  Antenme  enlarged  basally  ;  tuft  rather  beyond  the  middle.     An  early  spring 

species Ochlerotatus  aurifer  Coquillett. 

Antenna?  moderate  only;  the  tuft  before  the  middle 36 

36.  The  two  rows  of  the  pecten  of  the  air  tube  approximate  behind;  dorsal  plate 

of  anal  segment  a  saddle  only.     An  early  spring  species. 

Ochlerotatus  impiger  Walker. 
The  two  rows  of  pecten  well  separated;    dorsal  plate  more  than  half  encir- 
cling the  anal  segment 87 

37.  Tuft  of  the  tube  before  the  outer  third;  anal  gills  blunt.     In  rain  puddles. 

Ochlerotatus  sylvestris  Theobald. 
Tuft  of  tube  beyond  the  outer  third;  anal  processes  pointed.    In  rain  puddles. 

Aedes  fuscus  Osten-Sacken. 

38.  Comb  scales  few,  in  a  single  or  irregularly  single  row  __ :;'■' 

Comb  scales  more  numerous  to  many,  in  a  patch 4."> 

39.  Anal  segment  ringed  by  the  plate 40 

Anal  segment  not  completely  ringed  by  the  plate  ...  .-   42 

40.  Anal  gills  moderate,  normal 41 

Anal  gills  very  long  with  stout  central  trachea.     In  pools,  not  coming  to  the 

surface;  distribution  southern Ochlerotatus  dupreei  Coquillett. 

41.  Pecten  of  air  tube  running  about  one-third;  anal  segment  not  longer  than 

wide.     An  early  spring  species Ochlerotatus  pUnctor  Kirby. 

Pecten  of  air  tube  running  about  one-half;  anal  segment  longer  than  wide. 

Aedes  atlanticus  Dyar  and  Knab.- 


1  Ochlerotatus  cinereobor talis. 
1 1,  hi,  rotatus  serratus  (in  part  l 


12.  Scales  ol  the  comb  "i   the  eighth   sej •  1 1 1   smooth,  bluntl)    nded.     In 

hollow  trees  and  rain  barrels  Ochlerotatus  triseriatus  Bay. 

Scales  o(  comb  sole  shaped  with  tritid  apex.    The  yellow  fevei  mosquito. 

■.tiiiiim  i alopus  Mi 
i  I,    \nal  segment  ringed  bj  the  plate  n 

Anal  Begmenl  not  completely  ringed  bj  i In-  plate 

II.    \ii  tube  ovei  twice  a-  long  a-  wide,  its  i ten  ol  Ifl  to  22  teeth  15 

Air  i  a  I  if  twice  a-  l"ii:;  a-  wide  oi  less,  its  pecten  "i  12  to  1 1  i  >eth  Is 

Scales  ol  the  comb  with  the  central  Bpinule  Bhortei  than  the  bodj  ol  the 

Bcale;  pecten  of  the  air  tube  ol  equal  teeth  16 

Scales  ol  the  comb  with  central  Bpinule  as  long  a-  the  bodj  ol  the  scale; 

pecten  ol  the  air  tube  longer  outwardlj  17 

16.  Vn'  tube  i %\ •  >  and  o ball  times  as  l"n_r  as  wide;  comb  scales  moderate. 

The  Atlantic  coasl  Balt-marsh  mosquito     Oeh\  wllicitatu  Walker. 

Air  tube  three  times  as  long  as  wide;  comb  scales  long.     In  rain  puddles, 

with  a  southern  distribution  Ochlerotatus  mitchella  Dyar. 

17.  Air  tube  pecten  reaching  to  bey I  the  middle  ol  t r i » -  tube;  lateral  comb  ol 

21  scales  in  nearlj  three  rows  Ochlerotatus  trivittatus  Coquillett. 

Air  lulu-  pecten  not  reaching  to  the  middle  of  the  tube;  comb  ol  17  - 
in  two  imperfect  rows.     An  earl)  Bpring  -pern--. 

Ot  hlerotatus  auroidU  s  Felt, 
ales  ol  tin'  comb  leathered  on  the  Bides,  with  central  thorn. 

Ae'des  infirmatus  I  "•  ar  and  Kn 

-  ales  of  the  comb  evenly  feathered ;  no  central  thorn        10 

19.  Air  tube  one  and  one-half  times  as  long  as  n  ide  ;  pi  cten  teeth  broadly  ellip- 
tical.   In  puddles  along  the  Atlantic  seaboard     Qchlt  rotatusdamnosus  Bay. 
Air  tube  twice  as  long  as  wide;  pecten  teeth  narrowly  elliptical.     An  early 
spring  species  Ochlerotatus  inconspicuus  Grossbeck. 

50.  Air  tube  lour  times  as  long  a-  wide;  tracheae  narrow,  angled.     An  early 

spring  species  Ochlerotatus  fitchii  Felt  and  young. 

Air  tube  three  times  as  long  a-  wide  or  less  ">i 

51.  \iial  plate  small ;  gills  very  large,  sack  like,  spotted. 

Oi  •               -  varipalpus  <  Coquillett. 
Anal  plate  over  half  encircling  the  segment  :  anal  gills  i lerateor  smal 

52.  Comb  Bcales  tapered,  a  Bingle  median   Bpiuule  stoutei  or  larger  than  the 

real 
Comb  scales  bluntly  rounded,  the  median  Bpinule  resembling  theotl 

53.  Both  of  the  hair  tufts  on  the  front  of  the  head  multiple  54 
The  lower  head  tuft  single  i>r  double  (rarely  three) 

54.  Subdorsal  prothoracic  hairs  Bingle.     In  temporary  pool:.. 

Ochlerotatus  canadensis  Theobald. 
Ochlerotatus  nivitarsis  Coquillett. 
Subdorsal  prothoracic  hairs  multiple 

55.  Weakly  colored;  tufts  of  ventral  brush  Bhort-stemraed.     In  puddles  near 

the  sea  along  the  Atlantic  coast  Ochlerotatus  cantatoi  Coquillett. 

Darkly  colored  :  tufts  of  the  ventral  brush  long-stemmed.     An  earl)  spring 

Bpecies  in  the  Northwest  Ochlerotatus  pullatus  Coquillett. 

68.    Lower  head  hair  double  >or  triple)  ">7 

Lower  head  hair  single 

n/irmahu 
■  tchUrotattii  '  ■ 

[mpei fectly  known 


6 

57.  Comb  scales  with  lateral  apinulea  as  long  as  the  apical  one.    An  early  spring 

species. Aedes  grossbecki  Dyar  and  Enab.' 

Comb  scales  with  the  lateral  spinules  very  short.     An  early  spring  spei 

Ochlerotatus  pr<  tans  <  'i "->beck. 

58.  Apical  spinule  of  the  comb  scale  sharp  and  distinct     An  early  species  in  the 

Northwest       Ochlerotatus  aestivalis  Dyar. 

.Apical  spinule  of  comb  scale  not  sharply  distinct.     An  early  spring  species 

in  the  Northeast  ..  Ochlerotatus  subajtntans  Felt. 

"ii».   Anal  gills  moderately  long.     An  early  spring  species  in  the  Northeast. 

Ochlerotatus  laearensis  Kelt. 
Anal  gills  very  short,  bud-shaped.     The  Pacific  coast  salt-marsh  mosquito. 

Aedes  quaylei  Dyar  and  Knab.'-' 

1  Letridoplatys  tquamiaer  <  i  i  >  parti 
•  Ochlerotatus  lativittatus 

Approved  : 

James  Wilson, 

Secretary  of  Agriculture. 

Washington,  D.  C,  April  27,  1906. 

O 


L 


UNIVERSITY  OF  FLORIDA 


3  1262  09216  4945 


4T   >t-c^ 


■ 


- 


L^K/L 


